Yamaha XT660R, Service Manual

Page: 249 / 462

5 - 10
ENG
CYLINDER HEAD
EAS00225
REMOVING THE CYLINDER HEAD
1. Align:
• “I” mark
a
on the A.C. magneto rotor
(with the stationary pointer
b
on the A.C.
magneto cover)
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a. Turn the crankshaft counterclockwise.
b. When the piston is at top dead center (TDC)
on the compression stroke, align the “I”
mark
c
on the camshaft sprocket with the
stationary pointer
d
on the cylinder head.
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a
b
c
d
2. Loosen:
• camshaft sprocket bolts
1
NOTE:
While holding the A.C. magneto rotor nut with
a wrench, remove the bolt.
3. Loosen:
• timing chain tensioner cap bolt
4. Remove:
• timing chain tensioner
(along with the gasket)
• camshaft sprocket
• timing chain
NOTE:
_
To prevent the timing chain from falling into the
crankcase, fasten it with a wire.
1
5. Remove:
• cylinder head
NOTE:
_
• Loosen the bolts in the proper sequence as
shown.
• Loosen each bolt 1/2 of a turn at a time. After
all of the bolts are fully loosened, remove
them.
2
4
1
3